-

Author: OskarStark

validation/custom_constraint.rst

@@ -320,7 +320,7 @@ define those options as public properties on the constraint class:
 
             public function __construct(
                 $mandatoryFooOption,
-                string $message = null,
+                ?string $message = null,
                 bool $optionalBarOption = null,
                 array $groups = null,
                 $payload = null,